The diagram below shows the electromagnetic spectrum. The numbers indicate the approximate wavelength at the boundaries between the various regions of the spectrum.
For a device to be able to make use of electromagnetic radiation, it needs an aerial of approximately the same size as the wavelength of the radiation it is designed to work with. Which statement is correct?
A mobile phone uses radiation from region P.
A television satellite dish uses radiation from region Q.
The receptor cells in an eye use radiation from region R.
The remote controller for a television uses radiation from region U.
